57266

Appears in sequences

• Triangle read by rows: T(n,k) is the number of paths of length n with steps U=(1,1), D=(1,-1) and H=(1,0), starting at (0,0), staying weakly above the x-axis (i.e., left factors of Motzkin paths) and having k peaks (i.e., UDs), 0 <= k <= floor(n/2).at n=43A132893
• This is to A139026 as A139026 to A139025, see A139025 for details.at n=6A139027
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, -1, 1), (-1, 1, 0), (0, 1, -1), (1, 0, 0)}.at n=12A148057
• a(n) = (A271222(n)^2 + 2)/3^n, n >= 0.at n=12A271226